I take Tizanidine. I found Baclofen's side effects intolerable (swallowing difficulties, weakness, mental fog). Tizanidine knocks me out for 4 to 6 hours and provides some relief from night time spasticity. I can't take it during waking hours, as it'll knock me out, no matter how small the dose- but it seems to clear from my system within a few hours so that I don't have any side effects like sleepiness or brain fog the day after I take it.
I am finding that it is causing a bit too much relaxation now though and I am getting joint instability (causing pain) from lying in one position for too long. I may have to stop taking it due to the pain and joint stuff, but it sure worked wonders for about 3 years.
The effects can be enhanced by caffeine, so if you take a tablet in the morning with your coffee, it might cause some weakness issues or sleepiness when you're not expecting.